Even Bixby on samsung phones can’t do that, if you poll the current status of your AC using their API, changing 5 step cooling doesn’t appears on the status JSON file. I guess because they didn’t expose the API for it. And yes, they reset it to 100% which really sad.
I also posted a query regarding this ( 5 Step Cooling attributes in smartThings RestAPI for Samsung Windfree BeSpoke AI AC (Air Conditioner) )
Let’s see if we get any solutions.